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TPS715A01DRBTG4 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS715A01DRBTG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page TPS715A33 IN OUT V IN V OUT C1 0.1 µF 0.47 µF GND P D(max) + T J max * TA R q JA P D + VIN * VOUT I OUT TPS715Axx www.ti.com SBVS047E – MAY 2004 – REVISED JUNE 2011 APPLICATION INFORMATION The TPS715Axx family of LDO regulators has been optimized for ultra low-power applications such as the MSP430 microcontroller. Its ultralow supply current maximizes efficiency at light loads, and its high input voltage range makes it suitable for supplies such as unconditioned solar panels. Figure 14. Typical Application Circuit (Fixed Voltage Version) External Capacitor Requirements Although not required, a 0.047 μF or larger input bypass capacitor, connected between IN and GND and located close to the device, is recommended to improve transient response and noise rejection of the power supply as a whole. A higher-value input capacitor may be necessary if large, fast-rise-time load transients are anticipated and if the device is located several inches from the power source. The TPS715Axx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. Any capacitor (including ceramic and tantalum) that is ≥ 0.47μF properly stabilizes this loop. Power Dissipation and Junction Temperature To ensure reliable operation, worst-case junction temperature should not exceed +150 °C. This restriction limits the power dissipation the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum-power-dissipation limit is determined using Equation 1: (1) where: TJmax is the maximum allowable junction temperature. RθJA is the thermal resistance junction-to-ambient for the package (see the Power Dissipation Rating table). TA is the ambient temperature. The regulator dissipation is calculated using Equation 2: (2) Power dissipation resulting from quiescent current is negligible. Regulator Protection The TPS715Axx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, during power-down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might be appropriate. The TPS715Axx features internal current limiting. During normal operation, the TPS715Axx limits output current to approximately 500mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. Take care not to exceed the power dissipation ratings of the package. Copyright © 2004–2011, Texas Instruments Incorporated 7 |
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